草稿1

 

　　

#include <iostream> /* run this program using the console pauser or add your own getch, system("pause") or input loop */ int main(int argc, char** argv) { int num; scanf("%d",&num); printf("2049%04d\n",num);

 

 

	scanf("%d",&num);
	printf("2049%04\n",num);
	
	scanf("%d",&num);
	printf("2049%04\n",num);
	
	return 0;
}

int main(int argc, char** argv) {
    int x=1234;
    float f=123.456;
    double m=123.456;
    char ch='a';
    char a[]="hello world!";
    int y=3,z=4;
    printf("%d %d\n",y,z);
    printf("y=%d,z=%d\n",y,z);
    printf("%8d,%2d\n",x,x);
    printf("%f,%8f,%8.1f,%0.2f,%.2e\n",f,f,f,f);
    printf("%1f\n",m);
    printf("%3c\n",ch);
    printf("%s\n%15s\n%10.5s\n%2.5s\n%.3s\n",a,a,a,a,a);
    
    
    return 0;
}

 

 

int main(int argc, char** argv) {
    double x,y;
    char c1,c2,c3;
    int a1,a2,a3;
    scanf("%1d%1d%1d",&a1,&a2,&a3);
    printf("%d,%D,%d\n",a1,a2,a3);
    scanf("%c%c%c",&c1,&c2,&c3);
    printf("%c,%c,%c\n",c1,c2,c3);
    scanf("%lf,%lf",&x,&y);
    printf("%f,%f\n",x,y);
    
    return 0;
}

 

 

int main(int argc, char** argv) {
    char ans1,ans2;
    printf("复习了没？(输入y或Y表示复习了，输入n或N表示1没复习)：");
    ans1=getchar();
    getchar();
    printf("\n动手敲代码了没？（输入y或Y表示敲了，输入n或N表示木有敲）："); 
    ans2 = getchar();
    if(ans1=='y'||ans1=='Y'&&ans2=='y'||ans2=='Y')
    printf("\n罗马不是一天建成的：)n");
    else
    printf("\n罗马不是一天毁灭的。。。\n");
     
     
    return 0;
}

 

 

 

 

 

 

int main(int argc, char** argv) {
    char x;
    x=getchar();
    if(x>='0'&&x<='9')
    printf("%c是数字字符\n",x);
    else if(x>='A'&&x<='z')
    printf("%c是英文字母\n",x);
    else
    printf("%c是其他字符\n",x);
    
    return 0;
}

 

 

 

 

 

 

int sum, a0,n,q;
	a0=1;
	q=2;
while(scanf("%d",&n)!=EOF){

		sum=a0*(1-pow(q,n+1))/(1-q);
		printf("n=%d时,sum=%d\n",n,sum);
}
	return 0;
}